Write the electronic configuration of 14Si 15P 31Ga and 33AS
     Write the electronic configuration of _14Si, _15P, _31Ga and _33AS.   
  
  Solution
Si - 1s2 2s2 2p6 3s2 3p2
P - 1s22s22p63s23p3
Ga - 1s22s22p63s23p63d104s24p1
As - 1s22s22p63s23p63d104s24p3

